In a large bowl, mix eggs, milk, cream, sugar, cinnamon, and Vanilla. Grease a medium-sized square baking dish or pan with butter. Take your loaf of bread and tear it into chunks, filling your baking dish. Avoid making the bread chunks too small. Once the bread has filled the dish, pour your liquid mixture over the bread, making sure to cover the pieces evenly. Allow resting in the fridge for at least an hour or overnight. Once you’re ready to bake, preheat the oven to 350° F and bake for about 45 minutes.